<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>focus</title>
	<script src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
	<script>
		$(document).ready(function () {
			$("input").focus(function () {
				$(this).css("background-color","#cccccc");

			});
			$("input").blur(function () {
				$(this).css("background-color","#ffffff")

			})

		})

	</script>
</head>
<body>
Name :<input type="text" name="fullname"><br>
<br>
Email:<input type="text" name="email">

</body>
</html>